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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '417e4f821b2f4786460562be40b5bd32440314d695b292393bd2f35d037b3e42' 
  AND token = 'xkreKCyCNJeyaHKp6aMSoXSJMXIih+RXA371/24tHyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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