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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '513e567989fff16fa87692533d20dd160f51b760b475ff104f60c8176c95ac00' 
  AND token = 'bURKSlu4rkc2btJXhY9L9+eVLE7CJWaUnF8p1+r5bv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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