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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbca406e5782abc135ac6bd23afe9d1bd38100205e5f41c6fe02d81f0d32e0a0' 
  AND token = 'J5F0T1D0suV9pDQItuAqN2CKPzpg32N6d9JDvKr0i2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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