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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b97b8fdfc6077a0bffa1cf155445b5a8c3986008e10a0d8f1e78a44ec95f102' 
  AND token = 'rKjNRbSrK0pcYFa0XU0x7tDsKMkj5ppXYseroidTHkk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}