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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '956f1978b21931e0f06b8b3de75b9d9807718c6ac07b9bf462b711ea32d573ae' 
  AND token = 'uoiBVrzXeXiJpJdkq68sybprOCVx1oFqMnlPWiWRORk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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