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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ade48c4b90c025ae76de60dba74f5a7dd1cecc564d9f61f328c573c2da70c3ce' 
  AND token = 'p2gK2573Y7UAlil7ZeAowMbegX4MvW4VrzpE0T73Lp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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