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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb82d89a10325cae64ecc188405be2903a341f0710b8104a32f22dadfd93ca8a' 
  AND token = 'C5lFfbWhGPysalR3pY+RgZ4etnReuvX2f2k1QUcrxks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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