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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15e7da4a404fb7b17f0ea9db199734d7a1d93a066e9fefbc37ac569eab16002f' 
  AND token = '2gek8xAIATHry7q3tT1sBiSjPIEdYREyA4Da2tzpN88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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