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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c69d4730baafba6f869620dbc6ac2e02ff6518c22f004865badf9ece401381d0' 
  AND token = 'GHK/0sYa0b43OIhCxCicA/LNoGEA1VsKyPNvWHp/vDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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