Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0b0e9435ba107387a5fab3692597f6f6c0a1c5fcefb815da7d7ff3e8f9d104b' 
  AND token = '6SJ1i6vhaLsgUPYSvNag6Wm63NXGlwev4ELfo5rXCG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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