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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '670507d4fc37e42e5053ab8920d953d4cf5af7150f65408fc8c1317c48191eef' 
  AND token = 'G0g0MWmTvaUx0YfURFw34UpeZnV6hUwoF1urngjj7mk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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