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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '989b76e628b6d3bafe000e3eefda415204e00a0912646837fd774daee47403ec' 
  AND token = 'oxKZPXCAVN/4miXWX/kXojSDLa5kcrV/mPn01VIS3KA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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