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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81c9b66866aa41e0c81f5e62238ba7f2fbcb811fa47a77b69b3ad3005ff5c71e' 
  AND token = 'oi6oVvAFF8Ognl63hPDIrHzPVdS1O3UNEpudPH8+9oc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00101

JSON explain

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