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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '050c5b5193e708ca0fc24c361fa4a0acff3196b15e6f007b079f73e655284c03' 
  AND token = 'okn0M5GrYGcMEcUpZStP/uH98WdN0Tzyz/+V7Fnga7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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