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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '620de98f79cb5e38a25c5fab76b6223f0ffe2d18afc7fea728b71b88d04201d8' 
  AND token = 'tqr5FBS83v519cZccclrwW3ggRGfJZbc9ElULxs6x8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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