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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0bdcf6b4434b1e6dd3d58a9e6814637d8f4a57ad173bfd64435d348ac41eae4' 
  AND token = '3CeWjE6vuePNQtz20R3ZExS12/kM1XQVfG+h9uIbwvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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