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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39d79519b360ed1f276196132f31668bbb48ed8fe0a045c170dd38c21f999809' 
  AND token = '33g4ZSDkw7yCKmi1774F/3YUqGBckQZ1KidKYNH91ug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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