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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39feb3a732aa230d96b62c26153e28ffa4cc0230038e936a9c5f456846808d83' 
  AND token = '5/ByaLk0ObPw5TJqXqR7z09389cM+YOi2T1w7fIJd78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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