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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17edb6c161bfb5540c67b73e92747e86184d8019bc36bfefa34b60f72795d843' 
  AND token = 'drJqUMWWkInjoBejyyb3TZ187AN5uJyBTo5hjXquOPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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