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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '774cd6559c3a4df12bf080af9d49dcd7c0f01e724a5120c35ae9b7d43a5094fc' 
  AND token = 'w9km8wu3WryctpNO25eisFkSvfE+yH+FhwKLhPFNMvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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