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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88631a7ea68de3bac2f0ebeed025d91bd3efb99ad12f6f67c09b8ebd93e61255' 
  AND token = 'GWIZD3rqaVkqmrL7ASiLmbD77Ss1+aV3B/2i+TQIupo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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