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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c538340f180b26ce1631a3f4b5463304d363c12cc7f9148122875449541e1e48' 
  AND token = 'Lqd6QuxstlLIJxY4/EuYwduQ5EPZuK5AxKy4Vi8Fr/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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