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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f668a851c6dcc57e651e8d966ae72b08e8547f1f5f8b7d2c455a98bfd0d8047a' 
  AND token = '63k0FciHBs5chwNo+zll22QbcK8iD8eO5uFQPqdL/co=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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