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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4ac4a4b3192a396b3e871c93b0d5c0dbfe7ff486a647e101990a50d5f8ddacd' 
  AND token = '4lbDRmdzIagpsbiqALLdD4ByIov9njWG5Qh+hezjg+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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