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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98cd944b48ec648f0969408916f4b155f2ba45fbf265c8b96dc69a0788ad7c9e' 
  AND token = 'XQhH57A1ewUzwmYSAXKFXhla1wiNVoBzx4T+RCbn7HQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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