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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a748723b988a2a12db004cf41eb127e88272877a55b999e88d3191c94f55e23' 
  AND token = 'qFrv8CNMgXdiJCHjOEH3mX/Eas/rEzd10HxRcYRa8Hc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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