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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40fa99d85d52b7b5494affc7f1f394590eacbf6faeb81812b91d005aed3468cc' 
  AND token = 'OJ4apBOges4yFBx5tZsXQjq8uyOkOhWD+pTL07UC8nA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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