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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95d34ae28b7c6c65c34fdc43ea40e0ec3fe72b8ad38c2c830b699fdf92477553' 
  AND token = '8/uoiBO9mfO1HGVPLKE7OIT4NnomAHUaC8fogYvbSq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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