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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1129feadecc07764060d7c6805c2d877b50683eaf68f5d8b76fb670df40be7fb' 
  AND token = '98I+a8SpHitvTYUXHRzAeWd9ETS90CXuAsjnIKu1XxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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