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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42edcbc23f60912b535e55ccbea16c5738c47390cbb43b2629df36bd8c2431d7' 
  AND token = 'lVCuOD8AyRCYfb+UzF7uRvEuJ+G5NueCNZadNvsICP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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