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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3477dad3e1b33bee39491ce368d48e204b024ec59bb2682732439e9f83da163a' 
  AND token = '3AQJ+gYPGNwHlTYBV+dSCFle6+tDA7fZqd46YJBjuB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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