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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd56aef5693bc8d19bc23c5f412912d1649b4a6ab1845c31e30d60f01e76c5f4' 
  AND token = 'Iz7u2tiVpT5GOTeHmUtEcBUOthZNzEk2FUmzlmdLUvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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