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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '299cdd56cb4b05336d008eff2a00c7c303404f7e10330e8ebffa53eddba55009' 
  AND token = 'Bn532m58Xjkcuk+/WCWk3bpEh/1Ga4XFPE5P8SXp8Ro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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