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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7089ade48a9d8c8a84ed464f038b23cda519941be4a585e9c9409fcafde948e' 
  AND token = 'XUpvR9uO5FMWiQhNBi+4S1ZVpl+DWrUghlFmC6wXq18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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