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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f12e26b4f483ddf662c8e45ca87bba9825bb76b8514b7ec64eb9f62228dd1266' 
  AND token = '2RUDoxZnRG5s+MvFipWKHpFlGDy6WLhQK80n9ASAWiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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