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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cda9949bb72eeaf9bb4c567a5cd57169042a4ec73feb0ed1e725bcdd7ddc1eee' 
  AND token = 'QOmGT2F7Zuh5dp1WKAcluLcmBZgxMtbzpsRdRr3CNw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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