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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8baa4f8caf1df4e513d5a26a1613f0accb19cce6892f2b67b7654b2162270077' 
  AND token = 'R5+GSFcP/0qy6PaT+t4uV0J6tKetM/V17CJTe4WEXJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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