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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59601c2da11c7fc27375f8892d6ff3e11fba7c661f7228856f60eb30401ad10b' 
  AND token = '5DWzOwoxdQk87z5hSuCx29TmjJwO/cvvafijd4y+QX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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