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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f5fd23b4d0be85f910dbaed5e0d7485b8f178a7ca6c60e531129482cdbc6ecf' 
  AND token = 'd8vQ7goh84RJ7jkieCFiiRhhtyzvT4b5yjfTFXRsIYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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