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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84f85b9b2623edb3bc2f80c8c12e6f4daf567364e36ead3d323311381a665dcf' 
  AND token = 'f9L6ietabujp9who1vkMnHuH9LjRPJ1r22fYWS3iCk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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