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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1e4b16c9b2372b501990fb1a318f470b5c097bf64c01cc890eaac3bad7a70d8' 
  AND token = 'qQP1jkGPxVfANj9pFRq7KN5jKuM1hyOmn2d4E22Z+Fs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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