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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3515a6640c6a4783bfe03027be343696911e0559f0717b7e1f70607d2718300b' 
  AND token = 'OWC7FqXH7eXKr0xKKWfxAxLGuV4pi+I+3AEEmG3zfII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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