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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5eaaf44fbba2312f85da09ee53ee828aecf3d92be6a38fb19f4f8d8543ff052b' 
  AND token = 'JoeY4PH22CQNMlgnz2fL9mzbLaAql9kP0E/9n8ypwUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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