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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1290df4f3b2c79692705e265f2cf74b8334ae6ef013d4f47aa200fce1a3469af' 
  AND token = 'wKZhUd8yQivepk2VTdAKZqPnFoqpeuTxYYOIaBIh5pw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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