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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f7a5a504ddec4e5c93ac5e568183e0d7983f9c6dc1b6e70b632cd6bb57df053' 
  AND token = 'tc0IFnc8jzA7BOGzANN2tmktAM7tTmKNlS6nB2938As=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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