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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfb54cad5bbc4ad81f76f7c7ad82909968f243a13ed39f3d036620b99873a73a' 
  AND token = 'qiruXdG7Z2bcxOLu79Jr/qjP2kyjCUW4by+/veiik+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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