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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89679cdc34de87389e896fcdefaac1356e3a8a4dcecb1ba5f7bb231c58f10404' 
  AND token = 'ft1eFzvDdM3Qa4qG17bsC5i0kcuBOvTlHC41Jvwd0Sw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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