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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03d2f905d0b44d09ac9fa9e841d1b1fe4dac1221ceef08dd57ee77f6731532b5' 
  AND token = 'dDtr+5WerncjFaMOVXD0Zc7yuhknKzrdL2H+U97hjko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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