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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae4752c8fe52fc0b10cfccf746772af1a69b0ddc471a053667025b0a70946eca' 
  AND token = 'UyesdJqh8qEB/3DMfLIvXcy5FxxPmQf2W2a9SNj0d74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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