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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d17b97d54446494b37e95f19a67452cb217609cc4f350e530226ac64a7129bd' 
  AND token = '1dtQIWJiVRigjX/jniI2fc2q9u/v1RcRVwHXIEyF6Ew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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