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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08077c9f056f64f701681f20fa1b55795c75d680097ef29d647ebcb0f78b6fe0' 
  AND token = 'RECQr5MlYXgmb1kqaxxlJGN6sQD7GQeHf4ECAhPuGmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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