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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc2d6d5628983f5743dba98fbfce12b9ca620d9d4c0c443208f93326bf1dd344' 
  AND token = 'seoy8eHjVKN6bVhcC+em2teeZBORgYcn35ALOj9I5y0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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