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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7074783d46cabc8dbc22b83894c36dc3326c0770831bd02d1c7c9487420b49ac' 
  AND token = 'ujXbQVF4OOCnl1ZwoSnzVnTCMJeF2nfKlPC2KqFMsVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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