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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '626b8592a33cbf7d1d54a546f8aaa179e73fc2c9d84aad19713a8ac8299cf81f' 
  AND token = '86iHKeolhNONYQTqS/KFTxBhILjCNMuZRHM8obrSrGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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