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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acf510e4fb7a31390dd9a2797d6b93e551e2ffabfb7c1ea04122d275bc95e773' 
  AND token = 'yyBuj5CnNc6I2cd8foeWwdAIDezKV4AIQ1daBJw6+w8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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