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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fee418bd784abb98379598243251dc081092e0ec6f854ece36627d0f303b8e3' 
  AND token = 'WLAim9VknZl19HYFt/yDwZQTymfPvV9bHEq7LbOAi24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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