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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63b47bd33a9a546e16fc100ad0aa44ba2da3b5aa31c245255d64e68ded91f0f9' 
  AND token = 'J1X/Kp4MizR+zxqzUc6rL/rqFTcN60NjBasgfsl/jZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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