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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f73bfa099f440a10bce9df35a28274ae7b7dbf9e2a55d248066f9cf0fc792fa5' 
  AND token = 'KmjNK4SfGHx3Y9/eX9ngJ0tBSWrz+X6Kg0eEB3QgZ5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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